Halcro, I would not expect copper per se to do much to absorb or block a magnetic field, except by virtue of its thickness which would just physically space the LP and the cartridge that much further away from the source. I am glad to hear your report on the comparison between the TT101 and the Raven. There are many in the audio community who say otherwise, and I never could figure out a scientific basis for their claim, that you need a very massy platter to have good bass reproduction. It seems to me that a combination of torque and well done speed control would be as good. If you will recall, Dertonearm once wrote here that at minimum, a platter MUST weigh 35 lbs for good bass.
Lharasim. Are you certain that copper is not an effective EMI shield? TI Shield, which is a documented effective EMI shield, is composed of three layers: copper/permalloy/copper. True, it does not work unless the copper surface is grounded. Perhaps it is the permalloy layer that does the work. I don't actually know.
